Electric switch



w 259 @928, L5 ff 1K., EAUIERSCHMIDT ELECTRIC SWITCH.

Filed April '7, 1925 um@ @UQVSCMWMML Patented Sept., 25, lQI-.,

KUN@ BUERSCHMIJDT, OF HARLSHORST, GERMANY, ASSGNOB, T0 GENERAL ELEC-TRIO COMPANY, A CORFORATIiI DF NEW" ELECTRIC S'EUEI.

Application filed April '.7, 1925, Serial No. 531,352.0, and n GermanyMay 3, 192e.

i eliminated or at least reduced to a minimum.

lrloreover, .it is important ifor Space economy and sa'lety that thestriking distance between the contacts when the switch is open be amaxiniium lor a minimum spacing between conductors.

An object of .my invention is toln'ovide an improved electricl switch inwhich the sta-tic proi'iciities of t-he insulators are utilized to thebes" adwintage and in which a safe arcinp; distance between the contactsof the switch in the circuit open position thereof is obtained withoutso decreasingthe arcing distance between phase conductors as `tovnecessitate a great increase in the spacingv thereof.

`lli/ly invention will be better understood :trom the followingdescription taken in con- 'nection with the accompanying,` drawing andits scope vwill be pointed out in the appended claims.

ln the accompanying drawing Fig. 1 is an elevation ot an electric switchembodying my invention Fig'. 2 is a plan oi the switch shown `in Fig. 1;Fig. 3 is a part sectional view on 'the line 3--3 ot Fig. 2; and Fig'. 4is a plan oit modification of the embodiment ol" my invention shown inFi 1 and 2. i

Referring now to the several iilrures o't the drawing, a plurality otstationary supporting members, such as two substantially parat lelinsulators 10 and 11, are mounted on a suitable framework which maycomprise longitudinal and transverse s ructural meinbers such aschannels 12 and 13, and plates 141-.

he insulators 10 and 11 support line terminals 15 and 16 respectively.and one of the insulators 10 supports a suitable contact 17.Cooperating` with the contact 17 is a contact 18 which is mounted on asuitable support such as a movable insulator 19. rlhis insulat-or isarranged for revolution about an axis intermediate the insulators 10 and117 so as to act-nate the contact 18 from a position adjacent insulator10 to a position adjacent insulator 11, indicated by the dot and dashlines, in the circuit opening movement ol the switch and vice versa. Forthis purpose, the .insulator 19 is mounted on one end of a crank 20which is rigidly secured to a: shaft 21 rotu tai-,ably mounted on thesupporting framework.

rlhe anis of revolution of the insulator 19, that is the shaft 21, maybe substantally parallel to, and is preferably substantially equi- @5distant 'from the insulators 10 and 11 in order to obtain the n'iaximuindistance between the contacts 1'? 'and 18 in the circuit open `positi onoi the switch. The axis ot the shaft 21 may liecoplanar with the axesolf both of 7U the insulators 1() and 117 as illustrated in Fig. 2, oroi'liset trom the plane oi the axes of the insulators 10 and 11 asillustrated in Fig. 4t. rl`he distance between the movable insulator 19and its axis of revolutionn the shaft 21, 'To` or in other words thelength ol. the crank 20', may be approximately equal to one-halt ot thedistance between the insulators 10. and 11 in order to get the maximumContact separation without the necessity o't'unduly spread- 8U ine; thephase conductors. For the samepurpose,` and also 'for stillness, thecontact 18 may be relatively short.

lt will be obvious that with the arrangement shown in Figi'. 2, thearcingr distance be-4 35 tween conductors is reduced in the maximumtransverse displacement of the contact 18 only by approximately one-haltthe throw or' the Contact 18, while in the full open postion the contact1S is so positioned as not to oo decrease the effective arcing distanceben tween phase conductors when a plurality of switches are employedside by side in the respective phase conductors. With the arrangementshown in F ig. 4, the arcing' disne tance between conductors is reducedstill less, since the maximum transverse displacement ot the movableinsi'ilatoii' 19 from the plane of the aires oi? the insulators 10and`11 is considcrably less than the length oi' the crank 20.

ln either case, since the movable insulator does not have to transmitmotion by rotation about its own axis, it is not submitted to torsionand the bending' stresses induced on contact separation and closure arerelatively small.

ln order to insure correct alinement of the contacts 17 and 18 'forcircuit closing, a guide plate 22 having' a sloping face may be mountedshown in detail in Fig. 3. This plate is lill) lilith lill) arranged sothat the insulator supporting end of the crank rides up on the slopingface of the plate as the contact 18 'is moved to circuit' closing,rposition.

For conducting current from the stationary insulator 11 to the movableinsulator 19, an articulated connection *comprising links 23 and 24 maybe used or these may serve merely to support a flexible conductor whichcarries thev current'. n For obtaining the necessary 'freedom' oruniversality of movement, thev links 23 and 211 are connected to eachother at one end and at the otherend to the supports 11 and 19respectively by any suitable means such as swivel mountings or universaljoints, Vexamples 0i which are known to the art.

VVhatlelaim as new and desire .to secure i byQLetters Patent ot theUnited States is z- 1. An electric switchl comprising two stationaryline terminal supports, a contact lmounted on one of said supports, acooperating movable Contact and means for actuating said movable Contactto and from circuit closing'position with the stationarycontact,

mediate oi' and substantially parallel to said stationary supports Jfromapposition adjacent one of them toa position adjacent the other. 3. Anelectric switch comprising two stationa'ry line terminal supports, a.Contact y mountedon one ofsaid supports, a cooperating movable Contact,and means for actuating said movable contact to and from circuit closingposition with the stationary contact comprising a support mounted formovement ,about an axis substantially parallel to and equiidistantl`from said stationary supports from a position adjacent one of them to aposition adjacent the other.

4t. An electric switch comprising' two substantially parallel stationaryline terminal supports, a contact mounted on one of said supports, acooperating movable contact, and means for actuutinpT said movablecontact to and 'from circuit closing position with the stationarjvcontact comprising a support mounted 'for revolution about un axissubstantially parallel to and equidistant from said stationary supportsltrom a position ad jacent one of them to a position adjacent the other.

5. An electric switch comprising?r two sla tionary substautiallj/.f'parallel line lern'linal insulators, a contact mounted on one olE saidinsulators, a cooperatin;l contact, means for supportinfol andactuatingl said cooperating contact to and trom circuit closing.:Tposition with said stationary contact comprising an insulator mountedfor revolution about an axis olfset from the plane of the axes ol saidstationary insulators and cquidistant thereirom from a position adjacentone of them to a position adjacent the other.

G. An electric switch comprisiiu;` two stationary substantially parallelline, terminal insulators, a contact mounted on one of said insulators,a cooperatingcontact and means tor supporting and actuetingl saidcooperatingr contact comprising au insulator mounted 'for revolutionabout an axis ollset 'from the plane oi the axes ot said stationaryinsulators and equidistant therefrom from a position adjacent one oithem to a position adjacent the other through an angle ol' approximately1800.

7. An electric switch comprising two sub stantially parallel stationaryline terminal supports, relatively movable coolrierating contacts, onebeing mounted on one ot .said supports, means for actuating' the otherot said contacts to and from circuit closing position with thestationary Contact connnisingr a supportmounted for revolution about anaxis substantially parallel to and equidistant from said stationarysupports from a position ad jacent one ot them to a position adjacentthe other, and an articulated connection between said movable supportand one of the stationary supports.

ln witness whereof. l have hereunto :ict mv hand this 18th nay oitMarch, 1025.

KUNG BAUERSCl-l MID'V

